She paid $30 bucks total.
Answer:

Step-by-step explanation:
We want to find the equation of a parabola with vertex (0,5), focus at (0,7) and directrix y=3.
This is given by 
where p=2, h=0, and k=5
We substitute these values to get:

This simplifies to:

We solve for y to get:

The slope is 5/4
10-5. 5
——- = —
8-4. 4
DO
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S I M P L I F Y
Answer:
Height of prism = 7 inches
Step-by-step explanation:
Let h be the height of prism.
Hence,
